Maybe this will provide you with some inspiration for your room

Place a floor lamp or table and table lamp in the dark corner

Mount a series of art pieces on the far wall

Bring the color from your accent chair to the wall that supports the TV

Bring the same color to the wall of your staircase.

Add an area rug to anchor your room.

I love BeverlyFLADeziner's suggestions! I'd also add COLOR in addition to blue (and black and white.) Pick another color you like - could be pretty much anything - red, pink, yellow... and run with it.

You just need some large, colorful artwork for the walls. Choose something that you love that is personal to you, not something that just "matches" your colors.

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A mural would fill the large wall and add complimentary cushions.

Accessorizing your coffee table and adding a floor lamp would also be nice additions

Coffee table and rug are too small. Lamps are missing.

ART and lighting